Sensitivity analysis of various nailfold capillary parameters
| Cut-off value | Sensitivity (%) | Specificity (%) | Area under the ROC curve | 95% CI | |
|---|---|---|---|---|---|
| Number of capillaries/mm | 8.75 | 76.9 | 77.1 | 0.846 | 0.753 to 0.939 |
| Output limb width, μm | 16.72 | 80.0 | 74.4 | 0.866 | 0.781 to 0.950 |
| Input limb width, μm | 13.73 | 77.1 | 74.7 | 0.782 | 0.669 to 0.895 |
| Apical width, μm | 18.51 | 80.0 | 79.5 | 0.823 | 0.714 to 0.932 |
| Capillary limb length, μm | 165.37 | 65.7 | 56.4 | 0.686 | 0.561 to 0.812 |
| Capillary total width, μm | 44.46 | 62.9 | 53.8 | 0.704 | 0.580 to 0.829 |
| Ratio of output limb and input limb | 1.29 | 74.0 | 71.8 | 0.775 | 0.669 to 0.881 |
ROC, receiver operating characteristic.